Assignment 5–2 For each table, Give a meaningful name

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Presentation transcript:

Assignment 5–2 For each table, Give a meaningful name Use DBDL to specify the relation scheme Give the functional dependencies Give the corresponding table instance

Assignment 5–2 StaffProjHours (NIN, ContractNo, eName, hours, hNo, hLoc) PK: NIN, ContractNo AK: None FK: None FDs: NIN ===> eName hNo ===> hLoc ContractNo ===> hNo, hLoc NIN, ContractNo ===> eName, hNo, hLoc, hours Not in 2NF How many tables (relations)? Staff: NIN ===> eName Contract: ContractNo ===> hNo, hLoc StaffProjHours : NIN, ContractNo ===> hours

Assignment 5–2 2NF Staff (NIN, eName) PK: NIN AK: NONE FK: NONE FDs: Table (Relation) Instance (Remove duplicate records) NIN eName 1135 Smith J 1057 Hocine D White T 1160 Smith J

Assignment 5–2 2NF Contract (ContractNo, hNo, hLoc) PK: ContractNo AK: NONE FK: NONE FDs: ContractNo ===> hNo, hLoc hNo ===> hLoc Table (Relation) Instance (Remove duplicate records) ContractNo hNo hLoc C1024 H25 East Kilbride C1025 H24 Glasgow C1026 H25 East Kilbride C1027 H29 East Kilbride

Assignment 5–2 2NF StaffProjHours (NIN, ContractNo, hours) PK: ContractNo, NIN AK: NONE FK: NIN References Staff ContractNo References Contract FDs: NIN, ContractNo ===> hours Table (Relation) Instance NIN ContractNo hours 1135 C1024 16 1057 C1024 24 1068 C1025 28 C1026 15 1160 C1027 16

Assignment 5–2 Not in 3NF Contract (ContractNo, hNo, hLoc) PK: ContractNo AK: NONE FK: NONE FDs: ContractNo ===> hNo, hLoc hNo ===> hLoc How many tables? Hotel (hNo, hLoc) Contract (ContractNo, hNo)

Assignment 5 – Part II 3NF Hotel (hNo, hLoc) PK: hNo AK: NONE FK: NONE FDs: hNo ===> hLoc Table (Relation) Instance hNo hLoc H24 Glasgow H25 East Kilbride H29 East Kilbride

Assignment 5 – Part II 3NF Contract (ContractNo, hNo) PK: ContractNo AK: NONE FK: hNo References Hotel FDs: ContractNo ===> hNo Table (Relation) Instance ContractNo hNo C1024 H25 C1025 H24 C1026 H25 C1027 H29

Assignment 5–2 List the names of all tables of your final result. (not relationships!) Staff Hotel Contract StaffProjHours

Style NIN eName 1135 Smith J 1057 Hocine D 1068 White T NIN ContractNo Staff (NIN, eName) PK: NIN AK: None FK: None FD: NIN ===> eName Table Instance StaffProjHours (NIN, ContractNo, hours) PK: NIN, ContractNo AK: None FK: NIN References Staff ContractNo References Contract FD: NIN, ContractNo ===> hours Table Instance NIN eName 1135 Smith J 1057 Hocine D 1068 White T NIN ContractNo hours 1135 C1024 16 1057 24 1068 C1025 28 15

Style Staff (NIN, eName) PK: NIN AK: None FK: None FD: Table Instance NIN eName 1135 Smith J 1057 Hocine D 1068 White T StaffProjHours (NIN, ContractNo, hours) PK: NIN, ContractNo AK: None FK: NIN References Staff ContractNo References Contract FD: NIN, ContractNo ===> hours Table Instance NIN ContractNo hours 1135 C1024 16 1057 C1024 24 1068 C1025 28 1135 C1025 15

Meaningful Table Names Staff (NIN, eName) Patient (NIN, eName) Hotel (hNo, hLoc) Hospital (hNo, hLoc)